Method of and machine for operating upon shoe parts



' Nov. 12, v1935.

wf R. PRATT A 2,020,433

.METHOD OF AND MACHINE FOR OPERATING UPON SHOE PARTS Filed-F'eb. 23,1934 @Vf/WUR Y* MM ,i /5 T1317. 9 gg- Patented Nov. 12, 1935 UNITEDSTATES ZAS METHOD OF AND MACHINE FOR OPERAT- ING UPON SHOEl PARTSWilliam R. Pratt, Marlboro,rMass., assignor to United Shoe MachineryCorporation, Paterson, N. J., a corporation of New Jersey ApplicationFebruary 23, 1934, Serial No. 712,444 15 claims. (cl. 12J-55) Thisinvention relates to methods of and machines for nishing the edges ofshoe parts and is herein illustrated as embodied in a machine in whichan intensely hot tool is employed to treat the edge of a piece of upperleather.

A machine of this general type .is shown in United States Letters PatentNo. 1,464,504, granted August 14, 1923, upon an application filed in thename of Joseph Fossa. In such machines, the work, as` it is fed,encounters a plow which turnsy up the edge while the margin on one sideof the work along said edge and a corner of said edge are seared andshrunk by an intensely hot tool against the bottonr and side of whichthe margin and edge of the work are y held by the work support'and theplow. The re- .,sult of this'treatment is that the unshrunken side ofthe margin of the work eurlstoward the shrunken side, and a smallupstanding nn is formed between the plow and the adjacent side of thetool. This fin is bent over toward or upon l the body portion of thework by a hammer beneath which the edge of the work passes as it leavesthe plow and shrinking tool, saidhammer oscillating in a path which istransverse to the direction of feed movement of the work and acting toincrease the curl of the upstanding 1in and to press the n down upon thebody portion of the work.

The fin which forms the upturned edge of the work as it leaves the plowand shrinking tool is substantially vertical, and consequently thehammer is so constructed and oscillated that its operative face strikesthis n a blow which is directed from above on one side of the finoblique- `ly downward toward the body portion of the work, the purposeof this construction being to bend the n inwardly over said bodyportion. It sometimes happens, however, that a portion of the fin isbent down in the opposite direction, in which case the smooth, roundededge which is desired on the finished piece of work is not uniformlyproduced.

In order to insure that Ythe n or upstanding edge of the work shallalways be bent properly over the body portionof the work, there isp-rovided, inaccordance with the present invention,

- a hammer having two work-engaging faces ar- 1 rangedat an angle toeach other and located one in front of the other considered in thedirection of feed movement of the work, whereby succeeding portions ofthe edge of the work are engaged by them, one face acting to bend the Yupstanding edge of the work partially into place over or upon a bodyportion of the work and the viously bent-down portion is being pressed.

other face acting, when this part of the edge is Vsubsequently fedbeneath it to complete the operation. In the illustrated construction,there is provided, i-n that end of the hammer which is adjacent to theplow and shrinking tool and V5 which faces the oncoming Work, a recesswhich extends in the general direction of feed movement of the work, awork-engaging wall of said recess being inclined at such an angle thatthe 1in must be bent over toward the body portion 1o f of the work.Then, as the part of the edge which was thus acted upon by the wall ofthe recess is fed along farther, the remaining portion of the hammerdescends upon it to complete the operation. Thus the hammer at eachstroke l5 acts simultaneously upon two adjacent portions of the edge ofthe work. The wall of the recess acts upon the upstanding iin at oneportion of the edge to bend it partially into place and at the same timetheremaining portion of the ham- 20 mer acts to complete the operationupon the fin in another locality which had been previously operated uponby the wall of the recess.

The invention also provides a method which consists in shrinking oneside of a piece of work 25 along an edge thereof to produce anupstanding fin and bending down and pressing the fm in two steps carriedout in such manner that while one portion of the n is being bent down apre- Referring now to the accompanying drawing, Fig. l'is a perspectiveof a hammer of an edge- Vfinishing machine by which the method of theinvention may be conveniently practiced,

Fig. 2 -is a plan View of the work-engaging parts of the machine.

Figj3 is a section on the line III-III of Fig. 2 showing moreparticularly how, when the hammer f descends, the wall of the recess inthe hammer will engage the upstanding edge or nn of the 40 work, Y

Fig. 4 is a section similar to thatV of Fig. 3 and r with the shrinkingtool omitted showing the wall in the recess of thehammer in the processof bending the iin toward the body portion of the work,

Fig. 5 is a section similar to that of Fig. 4 but showing the hammer atthe end of its stroke,

Fig. 6 is a section like that of Fig. 5, except that rthe workV issectioned on a plane which passes through the shallow end of the recessin the face of the hammer, and Fig. '7 is a section on the line VII-VIIof Fig. 2

showing the nal Vappearance of the work after the portion of the edge ofthe work which is shown in Figs. 3, 4 and 5 has been fed beneath theplain face of the hammer which is located beyond the recess.

The machine, except for the Work-engaging portion of the hammer, is ormay be the same as that of the machine of the patent referred to above.The work |00 is fed away from the observer (Fig. 3) by cooperating feedmembers 9 and the lower member 9 moving back and forth in the line offeed and the upper member Si having a four-motion feed movement. As thework is fed intermittently, its edge is bent up by a plow l5 and heldagainst the bottom and side faces of a shrinking tool Vwhich acts tosear and shrink the margin of the work on one side. There is thusproduced on the work a thin upstanding edge or iin. Directly behind thepiow is a hammer |55 (Fig. 2) which engages the rln as it passes frombetween the plow and the shrinking tool and bends it over toward or uponthe work. In order to produce a smooth unbroken edge on the finishedwork, it is desirable that the fin be progressively bent over the bodyportion of the work without at any time being bent in the oppositedirection or crushed down vertically and that the hammer strike ayielding blow so as to provide for pieces of work of differentthicknesses. To this end, the hammer is swung down by mechanismincluding a spring 2| about the axis :c so that its operative facestrikes .a yielding blow directed obliquely downward toward the bodyportion of the work. The mechanisms for operating the feed members andthe hammer and for raising the shrinking tool to a high temperature willnot be described since their details of construction form no part of thepresent invention and any suitable edging machine may be employed.

It sometimes happens, particularly with certain kinds of leather, thatthe upstanding edge or iin is not bent uniformly over the body portionof the work at all localities; and the present invention provides ahammer having work-engaging faces which act in succession as the work isfed first to bend the fin partially over into place and then, as thework is fed farther, to act upon the partially laid-over n to completethe operation. In the illustrated construction these work-engaging facesare formed on a single member, namely on a small hardened plate 23 whichis fastened to the head of the hammer by a small screw 25 and forms partof said head. k'I'his head has two ends, an end 21 which faces theoncoming Work |90 and an end 29 which faces the receding work. In theend 27, which faces the oncoming work, there is formed a recess 3|which, in the illustrated construction, decreases in width and in depthfrom the end 21 toward the end 29 of the head of the hammer,-that is, itdecreases in the direction of feed movement of the work. Beyond orforward of the recess 3|, considered in the direction of feed movementof the work, the hammer has a work-engaging face 33 which is plain orsubstantially so, being herein shown as provided with small groovesextending thereacross in the direction of feed movement.

Referring to Fig. 4, it will be seen that, as the work is fed throughthe machine, any given point -on the upstanding fin will first beengaged in the manner shown in that figure by the right-hand wall of therecess 3| while the hammer head is moved obliquely downward from upperright to lower left and will be bent over by the deeper portion of therecess 3| into some such position as that shown in Fig. 5. At the sametime a portion of the edge of the work in advance of that portion shownin Figs. 4 and 5 will be bent further over into some such position asthat shown in Fig. 6, it being understood that the length of theintermittent feed movements imparted to the work is less than the lengthof the recess 3|, the particular point to be noticed being that theupstanding fin is engaged in such manner that it must bend over the workand that it can neither be bent in the opposite direction nor crushedstraight down. The hammer now rises and the work is fed forward,whereupon the flat face 33 of the hammer in its next, or in a subsequentdescent, pounds the fin down into the position shown in Fig. '7. Itshould be understood that the height of the upstanding fin is actuallyvery small, being commonly in the neighborhood of of an inch, .and thatits height has been exaggerated in the drawing in order to show moreclearly the operation of the hammer.

Having described my invention, what I claim as new and desire to secureby Letters Patent of the United States is:

l. A machine for finishing the edge of a piece of work having, incombination, work-feeding means, and a shrinking tool and a hammerlocated side by side with the hammer in the rear of the tool when viewedin the direction of feed -movement of the work, said hammer havingformed in the end adjacent to the tool and extending into itswork-engaging face a recess.

2. A machine for finishing the edge of a piece of work having, incombination, work-feeding means, and a shrinking tool and ahammerlocated side by side with the hammer in the rear of the tool whenviewed in the direction of feed movement of the work, said hammer havingformed in the end adjacent to the tool and extending into itsWork-engaging face a recess which decreases in width from the end of thehammer adjacent to the tool toward the other end of the hammer.

3. A machine for finishing the edge of a piece of work having, incombination, work-feeding means, and a shrinking tool and a hammerlocated side by side with the hammer in the rear of the tool when viewedin the direction of feed movement of the work, said hammer havingformedl in the end adjacent to the tool and extending into itswork-engaging face a recess which decreases in depth from the end of thehammer adjacent to the tool toward the other end of the hammer.

4. A machine for finishing the edge of a piece of' work having, incombination, work-feeding formed in the end adjacent to the tool andextending into its work-engaging face a recess which decreases in widthand depth from the end of the hammer adjacent to the tool toward theother end of the hammer.

5. A machine for finishing the edge of a piece of work having, incombination, means for feeding the work, means for shrinking the marginthereof to produce an upstanding rin, and a hammer for operating uponsaid fin, said hammer having in that end which faces the oncoming work arecess to receive the fin, one wall of said recess acting to bendsuccessive portions of the iin over toward the body portion of the work.

6. A machine for nishing the edge of a piece of work having, incombination, means for feeding the Work, means for shrinking the marginthereof to produce an upstanding fin, and a hammer for operating uponsaid 1in, said hammer having in that end which faces the oncoming Work arecess to receive the finone wall of said recess acting to bendsuccessive portions of the fin over toward the body portion of the work,the remaining portion of the hammer acting to press these laid-overportions when they have been fed beneath it. Y

7. A hammer for progressively operating upon the bent-up edge of a pieceof work fed past it, said hammer comprising two work-engaging facesarranged at an angle to each other andv located one infront of the otherconsidered in the direction of feed movement of the Work wherebysuccessive portions of the edge Vof the Work are engaged successively bythem, one face acting to bend the upturned edge of the work partiallyinto place over the body portion Vof the work, and the other face actingsubsequently to complete the operation.

8. A hammer for progressively operating upon the bent-up edge'of a pieceof work fed past it, said hammer having in that part of itsWork-engaging face past which the successive portions of the bent-upYedge are first fed a recess which extends in the general direction offeed movev ment of the Work and also having an unrecessed portionforward of said recess to Contact later with the saine successiveportions.

9. A hammer for progressively operating upon the bent-up edge of a pieceof work fed past it, Ysaid hammer having in that part of itsworkengaging face past Which the successive portions of the bent-up edgeare first fed a recess which extends in the general direction of feedmovement of the work, the depth of said recess, measured in the line ofapproach of the hammer face to the Work, decreasing in the direction offeed movement of the Work.

10. A hammer for progressively operating upon the bent-upl edge of apiece of Work fedV past it, said hammer having in that part of itswork-engaging face past which the successive portions of the bent-upedge are first fed a recess which extends in the general direction offeed movement of the work, the width and depth of said recess decreasingin the direction of feed movement of the work.

11. A hammer for progressively operating upon the bent-up edge of apiece of work fed past it, said hammer having in that part of itsWork-engaging face past which the successive portions of the bent-upedge are first-fed a recess which extends in the general direction offeed movement of the Work, the portion of the workengaging face of thehammer forward of the recess being substantially plain. I

12. A hammer for progressively operating upon the bent-up edge of apiece of work fed past it, said hammer having in that part of itsvworkengaging face past Which the successive portions of the bent-upedge are rst fed a recess which extends in the general direction of feedmovement of the Work, the Width of Said recess decreasing in thedirection of feed movement of the work, the portion of the work-engagingface of the hammer forward of the recess being substantially plain.

13. A hammer for progressively operating upon the bent-up edge of apiece of Work fed past it, said hammer having in that part of itsWork-engaging face past which the successive portions of the bent-upedge are first fed a recess which extends in the general direction offeed movement of the work, the Width and depth of said recess decreasingin the direction of feed movement of the work, the portion of thework-engaging face of the hammer forward of the recess beingsubstantially plain.

Y 14. A hammer for progressively operating upon the upturned edge of .apiece of Work fed past it, said hammer being provided in that end towardwhich the work is fed with a recess a wall of which engages Vand bendsdown a portion of the upturned edge and having a face located forward ofthe recess, `considered in the direction of feed movement of the work,adapted when the bent-down portion of the edge is fed beneath it, tostrike said bent-down portion.

15. The method of nishing the edge of a piece of work which comprisesshrinking and searing one side of the piece along an edge thereof tocause the unshrunken side to curl toward the shrunken side in suchmanner as to produce a thin upturned iin, 'and bending down and pressingsaid fin into contact With the body portion of the work in two stepscarried out in such manner that while one portion of the upturned n isbeing bent down, a previously bent-down portion is being pressed.

WILLIAM R. PRATT.

